1 ////////////////////////////////////////////////////////////////////////
2 //
3 // Copyright (C) 1996-2021 The Octave Project Developers
4 //
5 // See the file COPYRIGHT.md in the top-level directory of this
6 // distribution or <https://octave.org/copyright/>.
7 //
8 // This file is part of Octave.
9 //
10 // Octave is free software: you can redistribute it and/or modify it
11 // under the terms of the GNU General Public License as published by
12 // the Free Software Foundation, either version 3 of the License, or
13 // (at your option) any later version.
14 //
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of
17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18 // GNU General Public License for more details.
19 //
20 // You should have received a copy of the GNU General Public License
21 // along with Octave; see the file COPYING.  If not, see
22 // <https://www.gnu.org/licenses/>.
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24 ////////////////////////////////////////////////////////////////////////
25 
26 #if !defined (octave_pt_anon_scopes_h)
27 #define octave_pt_anon_scopes_h 1
28 
29 #include <set>
30 #include <string>
31 
32 #include "pt-walk.h"
33 
34 namespace octave
35 {
36   // In possibly nested definitions of anonymous functions, collect
37   // their scopes and the symbol records therein.
38 
39   class
40   tree_anon_scopes : public tree_walker
41   {
42   public:
43 
44     tree_anon_scopes (void) = delete;
45 
46     tree_anon_scopes (tree_anon_fcn_handle& anon_fh);
47 
48     // No copying!
49 
50     tree_anon_scopes (const tree_anon_scopes&) = delete;
51 
52     tree_anon_scopes& operator = (const tree_anon_scopes&) = delete;
53 
54     ~tree_anon_scopes (void) = default;
55 
fcn_parameters(void)56     std::set<std::string> fcn_parameters (void) const { return m_params; }
57 
free_variables(void)58     std::set<std::string> free_variables (void) const { return m_vars; }
59 
60     // The following methods, though public, don't belong to the
61     // intended user interface of this class.
62 
63     void visit_anon_fcn_handle (tree_anon_fcn_handle&);
64 
65     void visit_identifier (tree_identifier&);
66 
67     void visit_parameter_list (tree_parameter_list&);
68 
69     void visit_statement (tree_statement&);
70 
71     void visit_statement_list (tree_statement_list&);
72 
73   private:
74 
75     // Variable names that are function parameters.
76     std::set<std::string> m_params;
77 
78     // Other variable names.
79     std::set<std::string> m_vars;
80   };
81 }
82 
83 #endif
84